Ubisam-MobileGit/tasks/069-in-app-motion.md

# TASK-069: In-app motion

Status: implemented; required checks pass; being adjusted from the product owner's look on a device
Owner: Claude
Reviewer: human product owner

## Outcome

The app moves where it used to jump, and what moves is the launcher icon's tea cup.

1. Cold start: the cup on the icon's blue, steaming, for about a second, then it fades.
2. Loading: lists show grey placeholder rows with a light passing over them; everything else shows
   the steaming cup in place of the stock spinner.
3. The favourite star springs when its state changes.
4. A screen with nothing to list shows the cup bobbing above its message.
5. Entering and leaving a screen slides it a short way in from the side it was opened towards.
6. Pull to refresh brings the cup down with the finger; the steam appears near the release point.
7. A file's diff arrives row by row the first time it is shown.
8. Added while this was in progress (product owner, 2026-10-12): switching bottom tabs slides the
   whole screen sideways, the old tab gliding out as the new one glides in, and the tab's icon
   springs.
9. Added after that (product owner, 2026-10-12): the tabs inside a screen glide the same way.
   전체 저장소/즐겨찾기 and 이슈/풀 리퀘스트 keep their header and tab row still while the list under
   them changes sides. The branch screen's tabs already slid (a pager) and are unchanged.
10. Reported by the product owner (2026-10-12): the start stuttered as the cup left. The first
    screen was gliding in sideways underneath, as if a tab had been switched, while the cover was
    fading. The first screen now fades in where it stands, and the cover waits for it (at most
    1.5 seconds longer) before it leaves.
11. Asked by the product owner (2026-10-12): going from 홈 to 알림 should pass 저장소 and 작업
    on the way, quickly, not jump straight there. The four tab screens now sit side by side in a
    pager that only a tab press moves.
12. After the product owner's first look on a device (2026-10-12): opening a screen pushes it in
    from the right, the full width, as the one behind leaves to the left, and Back reverses it;
    this replaces the short fade of item 5, which read as a flicker. The repository tabs keep
    showing each tab's last list while it reloads, so nothing settles after the glide. All four
    bottom tabs stay composed, so a glide does not wait for a screen to be built.
13. Measured on the product owner's device over adb (2026-10-12), at their request: every tab
    change, repository tab change, opening and Back began with one frame of 45 to 118 ms on a
    120 Hz screen. A move now starts without every screen being drawn again; the two repository
    lists stay built side by side; a repository's branches open beside the list and not in place
    of it; nothing that loops is drawn while it is off screen.

## Scope

- Included: Compose's own animation APIs only. No new dependency.
- Excluded: videos made with Claude Motion; any change to what the screens load or show.

## Writable paths

- `app/src/main/java/com/ubisam/ubgitea/ui/components/Motion.kt`
- `app/src/main/java/com/ubisam/ubgitea/ui/components/Elements.kt`
- `app/src/main/java/com/ubisam/ubgitea/ui/shell/AppShell.kt`
- `app/src/main/java/com/ubisam/ubgitea/MainActivity.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/home/HomeScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/repositories/RepositoryListScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/work/WorkScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/notifications/NotificationsScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/workitems/WorkItemsScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/history/HistoryScreen.kt`
- `app/src/main/java/com/ubisam/ubgitea/feature/history/FileDiffScreen.kt`
- `tasks/069-in-app-motion.md`
- `docs/development-log.md`

## Acceptance criteria

- [x] Each of the thirteen items above is in the code and the app builds.
- [x] The splash covers the app without delaying it: sign-in, loading and the OAuth callback run
  underneath, and taps do not pass through the cover.
- [x] Moving between code tabs, or between pages of one screen, does not replay the screen
  transition.
- [x] Nothing animates off screen: the pull indicator composes only during a pull, and the diff
  rows animate once per file, not on scroll.
- [x] A list's loading message is still what a screen reader says.
- [ ] Seen on the product owner's device.

## Security and privacy

No additional concerns. No network, storage or credential code is touched.

## Required checks

```text
./gradlew compileDebugKotlin compileDebugUnitTestKotlin testDebugUnitTest assembleDebug lintDebug
```

## Evidence

See the development log entry for TASK-069.

## Review findings

None yet.